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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
CASH FLOWS FROM OPERATING ACTIVITIES:      
Net income $ 400,235 $ 231,418 $ 189,682
Adjustments to reconcile net income to net cash provided by operating activities:      
Deferred taxes (15,680) 17,572 (16,401)
Depreciation and amortization 54,727 37,739 24,002
Stock-based compensation 70,763 58,854 54,148
Net tax benefits from stock-based awards 0 0 15,888
Excess tax benefit from share-based payment arrangements 0 0 (16,773)
Equity in losses of investee 8,693 3,219 1,684
Other non-cash operating activities 17,252 13,847 12,031
Changes in assets and liabilities, net of effects of acquisitions:      
Accounts receivable (109,224) (90,990) (95,808)
Inventories (24,109) (5,481) (7,663)
Prepaid expenses and other assets (9,122) (8,669) (9,390)
Accounts payable 25,045 8,175 (3,395)
Accrued and other long-term liabilities 36,250 24,235 31,371
Long-term income tax payable (36,548) 68,958 7,622
Deferred revenues 136,399 79,662 60,656
Net cash provided by operating activities 554,681 438,539 247,654
CASH FLOWS FROM INVESTING ACTIVITIES:      
Purchase of property, plant and equipment (223,312) (195,695) (70,576)
Purchase of marketable securities (180,191) (390,244) (405,612)
Proceeds from maturities of marketable securities 375,105 349,240 387,873
Proceeds from sales of marketable securities 9,560 39,536 216,119
Purchases of investments in privately held companies (5,000) (12,764) (46,745)
Loan advances to equity investee 0 (36,000) 0
Loan repayment from equity investee 30,000 6,000 0
Acquisition, net of cash acquired 0 (8,953) 0
Other investing activities 765 (2,597) (8,031)
Net cash provided by (used in) investing activities 6,927 (251,477) 73,028
CASH FLOWS FROM FINANCING ACTIVITIES:      
Proceeds from issuance of common stock 16,635 14,461 13,778
Common stock repurchases (300,002) (103,793) (96,218)
Excess tax benefit from share-based payment arrangements 0 0 16,773
Employees’ taxes paid upon the vesting of restricted stock units (86,067) (46,168) (29,857)
Net cash used in financing activities (369,434) (135,500) (95,524)
Effect of foreign exchange rate changes on cash, cash equivalents, and restricted cash (4,733) 5,544 (3,374)
Net increase in cash, cash equivalents, and restricted cash 187,441 57,106 221,784
Cash, cash equivalents, and restricted cash at beginning of year 450,125 393,019 171,235
Cash, cash equivalents, and restricted cash at end of the period $ 637,566 $ 450,125 $ 393,019